How to use various remote selenium drivers with Cucumber

gistfile1.rb

# This should be placed inside features/support/env.rb

# So we could specify at command prompt desired remote address and browser, e.g.:
# be cucumber REMOTE=true REMOTE_BROWSER=ie REMOTE_ADDR=192.168.1.1

# But there are some peculiarities which should be further investigated:
# * chrome needs chromedriver executable
# * opera loses focus and no further execution possible
# * it's impossible to attach a file to remote browser in file-handling scenarios

if ENV['REMOTE'] == 'true'
  case
  when ENV['REMOTE_BROWSER'] == 'ie'
    caps = Selenium::WebDriver::Remote::Capabilities.internet_explorer
  when ENV['REMOTE_BROWSER'] == 'chrome'
    caps = Selenium::WebDriver::Remote::Capabilities.chrome
  when ENV['REMOTE_BROWSER'] == 'opera'
    caps = Selenium::WebDriver::Remote::Capabilities.opera
  else
    caps = Selenium::WebDriver::Remote::Capabilities.firefox
  end
  Capybara.register_driver :remote do |app|
    Capybara::Selenium::Driver.new(app, :browser => :remote, :url => 'http://'+ENV['REMOTE_ADDR']+':4444/wd/hub', :desired_capabilities => caps)
  end
  Capybara.default_driver    = :remote
  Capybara.javascript_driver = :remote
end